One of the components of a progressive income tax is the tax bracket where taxes increase proportionally as income increases.
This is different from flat tax. A system levies on every taxpayer at the same rate. For example, both taxpayer A's and B's income will be taxed at the same rate, say, 10 percent even if taxpayer A's income is $100,000 and taxpayer B's income is $2 million.
The underpinning [...]